Recently, HPWP(High-performance Work Practice) is one of the most interesting issues in HRM field. But, some black boxes remain with unsolved. Thus, this study has three goals: Identifying the individual practices which could be included in HPWP system, and finding the relationship between HPWP and individual attitudes(eg., job satisfaction, organization commitment)in meso-paradigm, and finding the mechanism that connects HPWPs with firm performance. Several important results have been observed. First, individual practices such as staffing/selection, training/development, collective incentive/bonus, internal promotion, participation, sharing information, job security could be included in HPWP system. Second, individual job satisfaction and organization commitment are different each firms and HPWP system has significantly positive effects on job satisfaction and organization commitment. Third, organizational job satisfaction that was aggregated individual job satisfaction has not mediating effect between HPWP system and firm performance. Finally, implication, limitation of this study and future research are discussed in conclusion session.